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RVK Stair Landing Connectors Specification

The Invisible Connections range of telescopic connectors was developed to solve the problem of unsightly support systems for precast slabs and beams, such as traditional bracketry and/ or corbel support details.

They consist of a cast-in, structural steel hollow section with inner structural steel hollow section deployed during installation. The position of the inner tube of the RVK unit is adjusted through a slot in the surface of the staircase element. The units have a safety stop at the back of the inner tube to prevent overextension. The range of RVK connectors are primarily intended for precast stairs and landings, with a standard capacity of 100 kN. They are also useful for conditions other than stairs.



  • No bolts required.
  • Recess in wall provides ample tolerance.
  • No traditional angle supports means no crane.
  • Recesses are formed between wall reinforcement.
  • Tolerance gap required only 20 mm between landing and wall.
  • No tools required.
  • No obstructions means a clear route for following trades.
  • All operations are safely conducted from above landing.
  • Connectors automatically fireproofed after grouting.
  • Connectors are concealed from view.
  • Handles any shape concrete element.

Product reference

  • [RVK 60P] – 60kN capacity.
  • [RVK 101] – 100kN capacity.
  • [RVK 101-30] – See options.
  • [RVK 101-30-E20] – See options.



  • RVK 101-30 (pinned version) provides an axial tie into the wall, satisfying robustness requirements where only two walls are available for connection, if this cannot be achieved using the standard RVK 101 in an orthogonal layout.
  • RVK 101-30-E20 (extended version) spans the large air gap between landing and wall whilst maintaining secure embedment (in wall).


  • Outer tube: 120 x 60 x 4 mm.
  • Inner tube: 100 x 50 x 6 mm.


Steel finish

  • [Hot dipped galvanized]
  • [Plain]



  • Steel (grade S355, minimum).

Concrete strength class

  • C35/45, minimum.

Reaction to fire

  • Class A1, according to EN 13501-1.

We were thinking how we could give the architect what they wanted: a finished landing with a shadow gap all around. We used the telescopic connection system from Invisible Connections, which made it a lot easier, both to install the wall recesses and to install the stairs.

Ali Solki, Project Engineer, A J Morrisroe 
Ali Solki, Project Engineer, A J Morrisroe

Telescopic connectors provide us numerous advantages for precast stair installation. Apart from improved time and efficiency, the health and safety gains over traditional support methods are a key driver to satisfy our own needs, as well as those of our clients.

Shane Dunleavy, Project Manager, Morrisroe 
Shane Dunleavy, Project Manager, Morrisroe

Thank you for sending the calculations and installation advice. The new calculation software looks great. Very clear, user friendly and with more design checks than the previous version. It’s a pleasure to see how you are constantly improving.

Stefan Pauceanu, Senior Structural Engineer, Ground Construction Ltd 
Stefan Pauceanu, Senior Structural Engineer, Ground Construction Ltd

We have completed installation of our stairs in both cores, using TSS connectors. Everything went smoothly, quickly and easily. The new anti-uplift brackets have done the job perfectly.

Matthew Bialecki, Senior Engineer, J. Coffey Construction Ltd 
Matthew Bialecki, Senior Engineer, J. Coffey Construction Ltd





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